Problem with WD external drive no longer being recongized by Mac Pro following use with NTFS PC. The external drive is WD. The Mac initially recognized the drive and actually transferred some files from the WD to the Mac HD. The WD was "ejected" from the MAC and then connected to my PC (NTFS). Some files were transferred to the PC but due to time cancelled the transfer and then unhooked the WD; I did not "eject" it from my PC because I have never had to do this before (my friend questioned this and I told him not to worry; guess what...) When he tried to hook it back up to his Mac he received the message "initialize, ignore, eject" and just ejected so as to not cause any problems. He tried hooking it up to his wife's PC and hers could not read it either; not sure if hers is NTFS or FAT32 (or if that even matters). Over 1 TB of info on the external drive; very important information.